ANSWER:
157.5°
Explanation:
We can calculate the sum of all the interior angles of an n-sided polygon, just like this:

In this case it is 16 sides, therefore:

Therefore, to know how much an interior angle measures, we must divide by the number of angles, that is, 16, like this:

That is, the measure of one interior angle in a regular 16-gon is 157.5°